investigation of low-temperature selective catalytic reduction of nox with ammonia over mn-modified fe2o3/ac catalysts

A series of iron-based catalysts supported on activated carbon (ac) and manganese-modified fe2o3/ac catalysts with various fe:mn ratios were prepared for selective catalytic reduction (scr) of no by ammonia at low temperature. it was found that the addition of a small amount of mnox into the fe2o3/ac catalyst contributed to an improvement of the no conversion. no conversions of approximately 100% were obtained for the 10fexmn/ac (x = 1, 3, 5) catalysts at 180-240 °c. the characterization results indicate that the addition of a certain amount of mnox into the 10fe/ac catalyst increased the dispersion of the amorphous state, increased the ratios of fe3+/(fe3+ + fe2+) and mn4+/mn3+, and improved the surface area and pore volume.